Last Updated：2025/12/05
Sentence
地質学者は化石群集を分析して、その時代の下部境界を特定した。
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Geologists determined the lower boundary of the period by analyzing fossil assemblages.
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Geologists determined the lower boundary of the period by analyzing fossil assemblages.
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Related words
lower boundary
Noun
Japanese Meaning
[地質学] 指定された地質年代に含まれる最も古い時刻、すなわちその時代の始まりに相当する境界 / [言語学] 指定された期間に含まれる最も最近の時刻、すなわちその期間の終わりに相当する境界
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